Keyword Analysis & Research: what is the symbol for standard deviation

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what is the symbol for standard deviation	1.48	0.9	8052	76	41
what	1.78	0.7	5777	85	4
is	1.69	1	4194	43	2
the	0.32	0.9	470	23	3
symbol	1.76	0.2	7411	79	6
for	0.3	0.8	8581	70	3
standard	0.21	0.8	494	45	8
deviation	1.61	0.5	4949	41	9

Keyword	CPC	PCC	Volume	Score
what is the symbol for standard deviation	1.61	0.1	2855	17